William c



(No Model.)

W. e. LOOKWO'OD.

Telephone.

Patented Oct. 19,1880.

.Fig 5 "Witnegses UNITE TATES ATENT Farce.

WILLIAM C. LOCKWOOD, OF CHICAGO, ILLINOIS, ASSIGNOR TO LOCKVVOOD TELEPHONE COMPANY, OF SAME PLACE.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 238,527, dated October 19, 1880.

Application filed April 8, 1880.

To all whom it may concern:

Bcit known that I, WILLIAM G. LooKwooD, of Chicago, Illinois, a citizen of the United States, have invented certain new and useful Improvements in Telephones, of which the following is a specification.

The objects of my improvements are to increase the power and efficiency of the instrument, and to protect the diaphragm thereof from accidental contact with the fingers of the operator or other thing in use.

I attain the first of these objects by means of two electric coils or spools arranged back of the diaphragm of the telephone on a cross-bar of soft iron not a magnet, which connects two bars of the same material to support the spools for the coils, which bars extend from the crossbar through the spools and approach the diaphragm, one of the coils connecting the main line and the zinc pole of a local battery and the other coil the opposite pole of the local battery and the earth.

The second object is attained by means of a wire-gauze protector arranged in front of the diaphragm, between it and the mouthpiece, which permits the sound to pass through it, but intercepts the passage of any object which might accidentally be thrust into the opening in use.

The mechanism referred to above is more particularly shown and illustrated in the accompanying drawings, in which- Figure 1 is a longitudinal central section of atelephonecontainingmyimprovements. Fig. 2 is a transverse section on the line 00 00, Fig. 1, and Fig. 3 is a side view of the protector detached.

Like letters of reference indicate like parts in the several figures of the drawings.

A is a cross-bar of soft iron, supported in the hollow handle B by the part a, which extends down into the handle and the screws a a, which enable the coils to be adjusted to the diaphragm.

A A are bars of like material as bar A, to which they are connected by an iron connection. These bars may be all made in one piece solid.

C C are spools of coil electric wire of the 50 usual construction, and are supported on the bars A A. One end of the coil C connects with the earth and the other with the zinc pole of a local battery, and one end of the coil 0 connects the main line and the other (No model.)

connects the copper pole of the local battery, so that the current passes from the main line over coil 0 to the local battery, and back by the zinc pole over coil C, and to the ground.

D is the diaphragm; d, a ring of non-conducting material, which separates and insulates the gauze protector E from the diaphragm. The protector is located and held be tween the opening in the mouth-piece and the diaphragm by having its edges secured to the outer covering of the telephone, to which the diaphragm is also secured in the usual way.

By means of the arrangement and connection of the coils above shown and set forth the power of a local battery is brought into the telephone to increase its power and efficiency, and by 'means of the gauze protector the diaphragm is secure from accidental contact with any object which would dint or bend it out of proper adjustment-a thing which frequently occurs in use without such protector.

My invention does not include two coils or electro-magnets arranged in a telephone back of the diaphragm when the coils are united by merely connecting one end of each coil together, but includes the same only when the connection of the two coils is made with the main and the ground wires, or their equivalents, and with both poles of a local battery, in the manner stated.

By local battery, as herein used, is meant a battery used at the place where the telephone-instrument is used.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. The soft-iron bars A A, in combination with the coils C C, arranged in a telephone back of its diaphragm, when one end of coil 5 C connects with the ground-line and the other with the zinc-pole of a local battery, and one end of coil C connects with the main line and the other with the copper pole of the local battery, or vice versa, substantially as and for the purpose specified.

2. In combination with the diaphragm of a telephone, a wire gauze protector insulated from and placed in front of the diaphragm, substantially as and for the purpose specified. 10 5 Witnesses: WILLIAM G. LOOKWOOD.

JNo. H. WHIPPLE, JAMES CANNON. 

